Lock



R. F. LINDENIVIUTH.

LOCK. APPLICATION FILED MAY I5, I9I9- Patented May 3, 1921.

2 SHEETS-SHEET 2.

stares girar RAYMOND F. LINDENll/IUTE., OF QUAKAKF, PENNSYLVANA. I

LOCK.

Application mea May 15, i919. serial No. 297,322.

To all whom t may concern:

ie it known that I, RAYMOND F. LINDEN- M'U'rii, a citizen vof the United States, residing at Quakake, in the county of Schuylkill and State of Pennsylvania, have invented certain new and useful improvements in Locks, of which the following is a specification.

My present invention relates to improvements' upon the lock disclosed in my eopending application 'Serial Number 267,196, and has for its object to provide improved constructions and arrangements of the various parts which are more eiicient in practice and less expensive to manufacture, and at the same time to provide a ,lock which is impossible to pick, or open with an inappropriate key.

An important object of my invention resides in the provision of a locking means co-acting with the bolt for locking the same in an operative position, which locking means is protected from triflin'g, or opening by means of an unauthorized key, by means which vcan only be moved to uncover the locking means'y by a proper key, and said means is normally engaged with said bolt when the same is in a locked position for preventing unauthorized retraction of the bolt.

Another object of my invention resides in the provision of a locking detent for retaining the bolt in an unlocked position, and is so constructed that it will readily disengage the bolt when a force is applied thereto, such as the insertion into the lock ofa keeper.

Other objects and advantages of the invention will become apparent during the course of the following description.

InA the drawings, forming a part of the description and wherein like numerals are employed to vdesignate like parts throughout the same,

Figure 1 is alongitudinal vertical section through the 4invention.

, Fig. 2 is a' longitudinal horizontal section of the same taken on the line 2?-2 of Fig. 1. l Fig. .3 is a transverse'section taken on the line 3-3 of Fig. 2.

Fig. 4 is a perspective view of the rectilinear movable bolt.

Fig. 5V is a longitudinal vertical' section through the invention, showing the same in ,locked position.-

lthe Vlower edges of the sides being Fig. 6 is a transverse section taken on the line 6-6 of Fig. 2. Y

Fig. 7 .is a longitudinal horizontal section of a modified form of invention.

Fig; 8 is a perspective view of the sliding plates composing the combination, with the means for normally `retaining the plates in an operative or lockedposition, andV y Fig. 9 is a perspective view of the lock .applied to a switch lever by means of aparticularly formed bracket forming the base and sub-base of the lock.

in the drawings wherein for the purpose of illustration is shown a preferred embodiment of my invention, 1 have illustrated the lock mechanism in connection'with Ya rectangular form of casing, but I do not desire to be limited to this particular form inasmuch asa circular casing orione of another suitable configuration can be used equally as well. l

- The keeper 10-in the present instance is shown in the rform of an invertedL U-shaped member, having its-free ends secured to a suitable support 11,'but 1 desire it t0 be understood that a keeper in the form of an upstanding flange having one or more openings therethrough to receive the corresponding number of vfingers carried by the rectilinear bolt, may be employed if found desirable.

rlhe base 12 of my limproved lock is in the form of the movable section of a hasp, which has the stationary section thereof secured to any suitable support. Each corner of the base 12 is provided with a threaded opening, the lower sunk to receive a screw 13. A transversely extending sloty 14; is provided in the base, for the passage of the keeper 10. A sub base 15 is provided with a rslot 1 6, corresponding to the slot 14 in the base for alinement with the latter, and each corner of the sub-base is rovided with a threaded aperture to aline with the apertures in the base. The casing 17 of the lock consists ofa top and four sides,

to snugly fit upon correspondingly beveled edges of the sub base 15, so as to make the sub 'base invisible and to protect the contents of the casing. The lower edges of the sides of the'casing 17 are. provided with an inwardly extending perforated ear 18 at end of which is counter beveled sach @Omer thereof, and the peroratees therein are threaded and aline with the apertures or openings through the base and sub base, so that the screws 13 may secure the casing to the sub base, and the sub base to the base. By mounting the casing upon the base in this manner, it will be seen that access cannot be gained to the bottom of the base to loosen the screws 13 when the device is locked. As clearly shown in Figs. 2 'and 3, the sub base is provided with a rectilinear slot 19 the sides or which are under cut for a purpose which will presently appear, and said slot extends lfrom one end upstanding pin oi" the base to substantially the central portion thereof to communicate with and extend beyond the slot 16. f

The rectilinearly movable bolt 2O of my improved lock is provided with a dovetailed bottom 21 ior reception in a similarly shaped slot 19 ofthe sub base. This bottoni 21 extends a substantial distance rear' wardly of the rear end oli the bolt. The bolt 20 is provided with a laterally extending arm 22 and the upperl Y)tace of the bolt is provided adjacent one end thereof with an 23. rJ'he bolt is normally urged across the slots 14 and 16 in the base and sub base .by means or a spring 24 having one end secured to posts 25 mounted upon the sub-base, and the opposite end of the spring rests upon the rearwardly eX- tending portion or the dovetailed bottom 21 ot the bolt and exerts a pressure against the rear end of the bolt.

The bolt is retained in its retracted position by means oit a movable detent 26, which assumes the form of a bar having its outermost end bent at right angles to be received in an opening 27 in the sub base and normally retained therein by means of a coil spring 28, which spring is retained in its proper position by means of a suitable bracket 29 secured to the sub base over the opening 2'?. The inner end 39 of the detent is adapted to engage with the toi-ward end of the bolt 20, when the bolt is in an unlocked position, and the detent is offset as at so as to spacethe free end from the sub base and so that said free end engage the bolt adjacent its upper edge. From this construction and arrangement, it will be evident that when the keeper 10 is inserted Vintothe lock to engage the freeend ofthe detent, very little pressure is needed to cause upward movement of the detent whereby it iscaused to disengagefrom the bolt and permit the bolt to move the keeper to its locked position.

I provide a locking mechanism, designated lgenerally by the numeral 32, in order toretain the bolt in its locked position and to prevent triliing with the lock in an attempt to retract the bolt without the use of a proper key, and this locking mechanism is arranged above the bolt avslight distance vforwardly through y from the free end of the detent 26. In the present instance, the locking mechanism is in the form oi a pair or sliding tumblers 33 and 34', as more clearly shownin F ig. 3, and thesel plates are adapted to slide simultaneously across the bolt 20 and are retained in their proper position by means of a suitable guide bracket 35. Both plates are provided substantially intermediate their ends with an L -shaped slot 36, which slots receive the pin 23 or the bolt therein when the bolt is in a locked position. As clearly shown in lig. 3, the lower plate`34 is oil'lset as at 37 adjacent its tree end so that it may be spaced from the free end of the upper plate. Vlfhese plates extendlaterally across the sliding bolt and their tree ends 33 projectV beyond one side or the bolt and are arcuated transversely for engagement with the bit of a suitable key. To the rear end 39 of each plate, is secured to the end a spring 40, and the opposite end 41 of the spring is embedded in a suitable groove in a spring retaining plate 42. In the present instance, there are two spring retaining plates 42 inasmuch as there are two plates comprising the locking mechanism,` and these plates 42 are secured to the sub base beneath one end of the bracket 35 by means of rivets4 43 or the like. From this construction, it will be apparent that the plates 33 and 34 are-normally urged so that their tree ends 33 project beyond the side of the bolt. Y

The means I providefor protecting the locking mechanism against trifling, or actu-4 ation with an inappropriate key, is a guard plate 44 which is vertically movable on the base through a slot in a supporting plate 45. This supporting plate is retained in spaced relation of the sub base by means of supporting columns .46, through which pass screws 47 for retaining the plate 45 is in its proper position. The bottom -48 of the guard 44 is curved andv is provided with a notch 49 to receive therein the laterally eK- tendine; arm 2 2 ot the sliding` bolt when it is in a locked position. If preferred, this curved face 43 may be provided with pins 50 or varying lengths so that the bit of an inappropriate key cannot engage the curved face to move the guard upwardly to expose the tumbler plates 33 and 34. The top 51 of the guard is flanged to overlie the edges of slot in the plate 45 so as' to retain the guard in position in the plate45 when4 the sliding bolt 2G is retracted A spring52 hasone end secured to the plate 45, while its `freeA end is bent to frictionallyengage with the langed top of the guard 44. A key hole 53 is of course provided in the top of the casing 17 and also in the plate 45` adjacent one longitudinal edge ofthe guard 44, and a -key post 54 is secured to the sub base 15 in order to retain the key in its proper position While it is being turned to open the lock.

.andby said ends of the tumbler plates and When it is desired to lock the lock to its keeper 10 the lock or keeper carrying member as the case may be, is swung so that the ykeeper 10 is inserted through the slot in the base `and sub base, which action causes the end the keeper to force the free end of the detent 26 out of 'engagement with the forward end of the sliding bolt 20. As 'this abutment. is relieved, the spring 24 will of course move the sliding bolt 20 rectilinearly forward so that the forward enc of the bolt passes through the U shaped keeper to prevent displacement of the same from the lock casing. During the forward movement cf the bolt, the pin 23 carried thereby will pass into the L shaped slots 36 in thepla-tes 33 and V34 by sliding along the inclined walls 55 of the slots. When the pinV abuts with .the walls of the -angularly disposed portions of these slots, the plates `will be forced farther across the sliding bolt by means of their respective springs 40, which action will cause the pin 223 carried by the bolt to be locked within the L shaped slots 36 of the combination plates. From this, it will be manifest that the bit of retraction of the bolt is impossible until the plates have been moved to such position so as to permit thewithdrawalv of the bolt pin from the L-shaped slots in the plates. L

Also, during the forward movement of the bolt, the lateral arm 22 thereof will be caused to engage the curved face of the guard 44 and elevate the same against the tension of its spring 52, until the recess 49 in the curved face is occupied by the laterally extending arm 22 which will cause the guard 44 to move downwardly to securely retain the arm 22 of the bolt in locked engagement therewith. Y The locked position of the device is illustrated in Fig. 5 of the drawings, and when it is desired to unlock the device, an appropriate key is ofcourse inserted through the key holes in the casing and plate 45 until it is positioned upon the key post 54. Then by turning the key in the usual manner, it will be permitted to pass the pins 50 on the curved face of the guard 44 so that it can engage the arcuated face of this member to elevate the same. The upward movement of the guard 44 of course exposes the curved ends 38 of the 'tumbler plates,

further turning the key, it will enmove them rearwardly against the tension of their. springs 40. This will cause the plates to move across the bolt 21 until the pin 23 thereof engages the angularly arranged walls of the slots 31. When the key has actuated these parts to the positions thus far outlined, by further turning the key it will engage with the laterally extending arm 22 of the sliding bolt and retract the same so that the pin 23 thereof is totally disengaged with the slots 36 in the tumbler plates.

The keeper 10 may then be withdrawn from the lock since the detent 26 has been moved upwardly against the tension of its spring 28. vlDuring the Youtward movement of the keeper, the detent will move downwardly toward the sub base untilthe free end 3() is engaged with the forward end of the bolt 20. rlhis detent of course prevents forward movement ofV .the .sliding bolt against the action of its spring 24.

ln Fig. 7 of the drawings, wherein is shown amodiiied formof invention, it will be noted that the tumbler 32 in this instance is in the form of a swinging plate or plates 56, the free end or ends of which extend across and beyond the sliding bolt; 20, and are provided with the L shaped slots 3G. The opposite end, or ends l of these swinging plates are pivotallyconnected to a stationaryv plate 57 -secured to the sub 'base by means of rivets 58 or the like. These tumbler plates are caused to normally ex'- tend across the sliding bolts by means of springs 59 carried. by the plate 57. |The other parts of the invention described above are also embodied in 'this modiiied form in the manner set forth. f

When it is desired to use the lock in connection with switch levers, the base and sub base ofthe locks are formed by securing together the free ends of a piece of metal 60. The intermediate portion of this piece of metalis bent into suitable formto embrace the switch lever 61, and is secured to the lever by any suitable means. The Y keeper 10 in this particular instance is secured to a tie, and when the lever is swung to lock the switch, the lock is vofcourse carried thereby and the keeper passes through the base and sub base in the manner loutlined above.

The foregoing description and the drawings have reference to what may be consider-edthe preferred, or approved form of invention. It is to be understood that I may make such changes in constructionand arrangement and combination of parts, materials, dimensions, etc., as may prove eX- pedient and fall within the scope of the ap-` pended claims.

Havingthus fully described my invention, what l claim as new and desire to secure by Letters Patent, is: I

1. In a lock, the Vcombination with a'bolt, a tumbler mechanism for the bolt, means disposed to Vprevent engagement of unauthorized tools with said tumbler mechanism, and said means adapted for retaining the bolt in a locked position, and being adapted to be engaged by a proper key and moved and the bolt retracted with one turn of said proper key.-

2. In a lock, the combination witha bolt, a tumbler mechanism for the bolt, of movable means disposed to prevent engagement of unauthorized keys with said tumbler mechanism, and adapted to retain the bolt in a locked position, said means having means to prevent its vbeing moved by an unauthorizedkey, and being adapted to be engaged Yby a proper key and moved and the bolt retracted with one turn of said properfkey.

f '3. In a lock, the combination with a bolt; a tumbler mechanism for the bolt, of movable means disposed in the path of movement of a keyl to prevent engagement of an unauthorized key with the tumbler mechanism, and said means being capable of being engaged by a proper key and moved to permit engagement-thereof with the tumbler mechanism.

4;. In a lock, the combination with a bolt and a tumbler mechanism, of a movable guard for retaining said bolt in a locked position, said guard being disposed in the path of movement of a key to prevent engagement of unauthorized keys with the bolt and tumbler mechanism, said guard having a cam face, and an abutment thereon to prevent unauthorized keys acting upon said cam face, and said guard being capable of being moved by the proper key engaging said cam face to permitengagement of the key with the bolt and tumbler mechanism.

' InI a lock, a base, a supporting plate arranged in spaced relation to the base, a bolt slidable between the base and plate, a tumbler mechanism for the bolt, a movable guard member mounted inthe plate and cooperating with the bolt to lock the same against movement, said member being disposed in the path of movement of a key to prevent engagement of unauthorized keys with the bolt and tumbler mechanism, and said guard member being adapted to be moved by a proper key `to permit engagement of the key with said bolt and tumbler mechanism. Y f

6. In a lock, the combination with a sliding bolt having a laterally extending arm thereon, of a movable guard having a curved face and recess therein for reception of said laterally extending arm when the bolt is in a locked position, and a key adapted for engagement with said arcuated face of said guard to move said guard out of engagement with said laterally extending arm whereby said key may engage th laterally extending arm to retract said bo t.

7 A lock, a key therefor, the combination with a tumbler mechanism, a movable guard disposed in the path of movement of said key to prevent unauthorized keys from engaging said tumbler mechanism, said guard having a curved face, and abutments on said curved face to prevent actuation of said guard by unauthorized keys.

In testimony whereof I affix my signa ture in presence of two witnesses.

RAYMOND F. LIN DENMUTH.

Witnesses:

HOWARD L. MEDLAR, ALBERT L. WERNER. 

